Embossing-die.



RR. KUHLMANN.

EMBOSSING DIE.

APPLICATION FILED MAR. 24. 1908.

901 ,1'09, Patented Oct. 13,1908.

4 7 Jive/liar FREDERICK R. KUHLMANN,

' TATES- PATENT OFFICE ooMr'ANY, or EAST ORANGE, NEW JERSEY, ACORPORATION or NEW JERSEYS smossmeem.

lilo. 943L109.

specification of Letters Patent.

Applicttionflled March 24, 1908. Serial No. 428,027.

T 62 1 whom it my 60mm.-

se a known that I, Fnnnnnion R. KUHL- MANN, a citizen of the UnitedStates, and a resident of Marseilles, in thecounty of Lasa-lle' andState of Illinois, have invented certain new and useful Improvements indo hereby declare i Embossing-Dies; and I that the following is a full,cl ar, and exact referred to.

Embossing dies of; the referred to are made thin and flexible so thatthey may be attachedby adhesive material tothe improssion cylinder of aprinting press, and are adapted to operate in connection with acompanion die formed by a block or plate attached to the reciprocatingbed of the press; the dies being made very thin in order that they willprojecttoa slight extent only from the face of the impression cylinderso as not to interfere with the usualfunction of such cylinder inpressing the paper or sheet material against printin types, scoring diesor cutting dies carried by the bed of the press. Heretoforesucljr thindies have been made of fiber composition or papi'er infich and givenform when in a soft or plastic condition by pressing the same against acompanion die or matrim- Dies so made, althou'gl'i the working facesthereof are given a considerable degree of hardness by reason of thecharacter of the composition used, have little diirability and soon wearout in service.

The object of the present invention is to provide such die with aWorkingfa'ce of metal, without material-1y increasing the thickness ofthe body of the dieyand' thus retaining its flexible character, enablingit to.

readily conform to, and to be secured by adhesive'm'aterial upon thesurface of an im-' pression cylinder.

The" invention consists in the matters here'- inafter described-andpointed out in the appended claims. I

The invention may be better understood by reference to the acc'o'panying drawings, in which,-

Figure I is a' face View of a die with parts broken away. Fig. 2' is atransverse ver- OF MARSEILLES, ILLINOIS, ASSIGNOR TO HOWE & DAVIDSQ'N fPatented Oct. 13, 1908.. I

tical' section on a greatly enlarged scale'taken' on line 2-2. Fig. 3 isa' cross sectional View illustrating separately the layers of materialconstituting a die. Fig. 4 illustrates the method in. which the face ofthe die is formed by meansof male and female dies. Fig. 5- shows methodin which the embossing design is formed on the body of the die by meansof a female die and a flat faced pres.

sure plate. Fig. 6' illustrates the m'anner'in which the body and faceof the die are combilled by means of a: female die and an ims pression'plate. Fig. 7 is a sectional view showing a finished embossing diefastened to an impression cylinder of a" high speed press.

In said drawings, 1 illustrates a rectangular layer of fibrousmaterial,- such as paper or strawboard, constituting a fibrous backingmember corresponding instructure with the thin and flexible dies asheretofore made.

'3 illustrates a rectangular layer of very thin metal suchas sheet ironor the so-c'alled taggers iron. Between the fibrous back ing member 1and the metal layer 3' is interposed a layer 2 of cheesecloth or somelike woven fabric. ,The three layers are secured together by adhesivesubstance, the layer of cloth or woven material being employed in orderto secure a strong and permanent connection between the metal. facinglayer. The cloth is secured to fibrous backing andthe metal facing bymeans of flour paste, the

same being used in preference to glue or the like because it is found toadhere firmly to a smoothametal' surface, such as the back of the metalfacing layer,- and is not liable as is glue to break or give way whenthe parts joined by same are subjected to sharp blows or flexure. 'Thebacking member may be secured to the surface formed by the cloth,

layer, by glue or the like, no difiiculty being experienced in securinga strong and permanent union between .the cloth and fibrous compositionby the use of fish glue or any other suitable adhesive material. A diemade as described will be flexible enough to readily conform to thecurved surface of the impression cylinder and so thin that it willproject but slightly from the surface of said cylinder when attached.thereto.

As a further improvel'nent in embossing dies of this character, the bodyof the die is made with very thin edges and tapering toward said edgesat its marginal parts. This construction in the die prevents contact ofsaid margins with the paper being embossed, and to thereby avoid themarring of the paper outside of the embossed art thereof.

Fig. 7 illustrates a die embo ying my invention, as used in connectionwith a press -of the kind having a rotating cylinder which presses thepaper or sheet material against cutting dies, printing types or thelike, carried by the reciprocating bed of the press.

In said figure 8 represents the impression cylinder of such a press tothe surface of which the die isattached by means of an adhesivesubstance.

9 designates the paper or sheet material to be embossed and 10illustrates a female 'die or matrix conforming to the face of the die onthe impression cylinder. I Said matrix or female die is secured to thebed 11 of the press and has backward and forward move ment therewith atproper intervals during I the operation of the press.

My novel process of manufacturing embossing dies of the kind described,embraces steps as follows: A layer of cloth is fastened to a layer oftaggers iron by means of flour paste. The connected layers of metal andcloth are then subjected to pressure between dies, such as the male die4. and female die 5 (Fig. 4), said female die 5 corresponding in formwith the female embossing die or matrix used in connection with thecompleted die in the use of the latter on the press. A piece of thickpaper or strawboard is next moistened and treated on one side with asurface hardening compound which will usually consist of plaster ofparis, dextrineembossed central or working portion thereof toward, itsedges. The metal layer is next placed on the female die with its.projectin parts entering the depressions of the san die, and a thincoating of adhesive substance, such as fish glue, is applied to thecloth surface of the metal layer. The backing member is then placed withprojecting members opposite and fitting into the indentations ordepressions in the rear face of layer 2 and the two layers are pressedto ether y the use of the flat-faced pressure p ate 6. A sufficientpressure is employed in this operation to bring the facing and backinglayers in close contact with each other and secure their firm adhesion.The process therefore results in the formation of an integral structureembracing a fibrous backing having a flat-surfaced back and a hardembossing surface possessing a high degree of durability and capacity toresist the pressure to which the projections on its working surface aresubjected in service.

I claim as my invention 1. An embossing die comprising a facing layer ofthin sheet metal, a layer of cloth secured to the rear face of saidfacing layer by adhesive material, said layers being embossed to giveform to the face of the die, and a backing layer which conforms on itsfront face to the rear surface of the connectcd metal and cloth layersand which is secured to the same by an adhesive substance.

2. An embossing die comprising a facing layer of thin sheet metal, alayer of cloth secured to the rear face of said facing layer by adhesivematerial, said layers being embossed to give form to the face of thedie, and a backing layer of fibrous material.

3. An embossing die comprising a facing layer of thin sheet metal, alayer of cloth secured to the rear face of said facing layer by adhesivematerial, said layers being embossed to give form to the face of thedie, and a backing layer the front face of which conforms to the rearsurface of the connected metal and cloth layers, and which is secured tothe same by an adhesive substance, said backing layer being tapered tothin edges at its margins.

4:. The process of making a thin, flexible embossing die which consistsin embossing a layer of thin sheet metal, forming a layer of fibrousmaterial by pressure in a die to conform on its front face to the rearsurface of the embossed sheet metal layer, andsecuring said layerstogether by adhesive material.

5. The process of making a thin, flexible embossing die which consistsin securing to the rear surface of a piece of thin sheet metal a layerof cloth, embossing the connected layers of sheetjmetal and cloth togive form to the face of the die, forming a layer of fibrous material bypressure in a die to confofm on its front-fag mile rear 511%, ,.theconnected metal and cloth layers, and

saiiilg'er offibrous-ma terial t6 the.

, connected m ,and clothl'ayers by an adshesivesubstanc. w

In testimony, that I as my invention Laflix my signature i n thegfesence' of "fwb 'wi'tne sss, arch A. D. 1908. 7

. Witn esses'fv -W.. B. DAVIDSON, H.,P. Snows.

FBEDERICKR, KUHALMANN.

